Source code for pyarrow.hdfs

# Licensed to the Apache Software Foundation (ASF) under one# or more contributor license agreements. See the NOTICE file# distributed with this work for additional information# regarding copyright ownership. The ASF licenses this file# to you under the Apache License, Version 2.0 (the# "License"); you may not use this file except in compliance# with the License. You may obtain a copy of the License at## http://www.apache.org/licenses/LICENSE-2.0## Unless required by applicable law or agreed to in writing,# software distributed under the License is distributed on an# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY# KIND, either express or implied. See the License for the# specific language governing permissions and limitations# under the License.importosimportposixpathfrompyarrow.utilimportimplementsfrompyarrow.filesystemimportFileSystemimportpyarrow.libaslib

[docs]classHadoopFileSystem(lib.HadoopFileSystem,FileSystem):""" FileSystem interface for HDFS cluster. See pyarrow.hdfs.connect for full connection details """def__init__(self,host="default",port=0,user=None,kerb_ticket=None,driver='libhdfs',extra_conf=None):ifdriver=='libhdfs':_maybe_set_hadoop_classpath()self._connect(host,port,user,kerb_ticket,driver,extra_conf)def__reduce__(self):return(HadoopFileSystem,(self.host,self.port,self.user,self.kerb_ticket,self.driver,self.extra_conf))def_isfilestore(self):""" Returns True if this FileSystem is a unix-style file store with directories. """returnTrue@implements(FileSystem.isdir)defisdir(self,path):returnsuper(HadoopFileSystem,self).isdir(path)@implements(FileSystem.isfile)defisfile(self,path):returnsuper(HadoopFileSystem,self).isfile(path)

[docs]defmkdir(self,path,**kwargs):""" Create directory in HDFS Parameters ---------- path : string Directory path to create, including any parent directories Notes ----- libhdfs does not support create_parents=False, so we ignore this here """returnsuper(HadoopFileSystem,self).mkdir(path)

[docs]defconnect(host="default",port=0,user=None,kerb_ticket=None,driver='libhdfs',extra_conf=None):""" Connect to an HDFS cluster. All parameters are optional and should only be set if the defaults need to be overridden. Authentication should be automatic if the HDFS cluster uses Kerberos. However, if a username is specified, then the ticket cache will likely be required. Parameters ---------- host : NameNode. Set to "default" for fs.defaultFS from core-site.xml. port : NameNode's port. Set to 0 for default or logical (HA) nodes. user : Username when connecting to HDFS; None implies login user. kerb_ticket : Path to Kerberos ticket cache. driver : {'libhdfs', 'libhdfs3'}, default 'libhdfs' Connect using libhdfs (JNI-based) or libhdfs3 (3rd-party C++ library from Apache HAWQ (incubating) ) Notes ----- The first time you call this method, it will take longer than usual due to JNI spin-up time. Returns ------- filesystem : HadoopFileSystem """fs=HadoopFileSystem(host=host,port=port,user=user,kerb_ticket=kerb_ticket,driver=driver,extra_conf=extra_conf)returnfs